JPS60154762A - Automatic answering telephone set - Google Patents

Abstract

PURPOSE:To prevent malfunction by making a talking recording and talking reproducing function effective only when a trunk line connected to an automatic answering telephone set is closed. CONSTITUTION:A circuit 1 supervising the closing of the trunk line and a telephone set 9 is connected to trunk lines L1, L2 via a sectioning device 11. When the operation of photocouplers 12, 13 is detected by a control circuit 7 by a bell signal at incoming, a relay 22 is activated. An output A is kept to a high potential or a low potential in this case and an output B is brought into a high potential. When a handset of the telephone set 9 is hooked off, the output C goes to a high potential and the closing of the line is detected. When an indication signal such as talking recording and talking reproduction is fed to the control circuit 7 from a keyboard 8, a tape drive section 6, a transmission amplifier 4 and a recording amplifier 5 or the like are activated. Since the control circuit 7 operates a tape or the like after the closing of the line is detected, accidental erasure of the recording tape is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an answering machine having call recording and call playback functions.

In the conventional answering machine of this type, the central office line is connected in an alternating current manner by operating the call recording instruction switch during the switch for instructing function control, and the message tape records the signal from the central office line at the same time. The system operates as follows, and by simultaneously operating a call recording instruction switch and a call playback instruction switch among the switches, that is, by issuing a call playback instruction, the recorded contents of the business tape are sent to the central office line. ing.

For this reason, when using conventional answering machines, call recording instructions and call playback instructions are set independently. Although the purpose is to send the recorded information to the other party, it has the disadvantage that it is set to the call recording or call playback state even when there is no other need. This also has the disadvantage that unnecessary signals may be sent to the line or recorded contents of the business tape may be accidentally erased.

The present invention has been made in view of the above, and includes a detection means for detecting the closure of the central office line to which the answering machine is connected, and has call recording and call playback functions only when the central office line is detected to be closed. It is an object of the present invention to provide an answering machine that eliminates the above-mentioned drawbacks by making it effective.

The present invention will be explained below with reference to Examples.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a line monitoring circuit for monitoring the connection of a central office line, and is configured as described later.

2 is a relay for selectively connecting the office line to the line transformer 3, 4 is a sending amplifier, 5 is a recording amplifier, and 6 is a tape drive unit. Reference numeral 7 denotes a control circuit which drives the output amplifier 4 to put the tape drive section 6 into the playback state when transmitting the contents of the response tape or message tape in response to the signals from the keyboards 1-8, respectively, and sets the tape drive section 6 to the playback state. When recording the voice signal from the caller on the tape, the recording amplifier 5 is driven and the tape drive section 6 is controlled to the recording state.Furthermore, when call playback or call recording is instructed, The structure is such that call playback and call recording are enabled only when the line monitoring circuit 1 receives a detection signal indicating that the office line is closed. Note that the control circuit 7 controls the relay 2 by the output of the control circuit 7 in response to the connection of the line, the transmission of a reproduction signal, and the reception of a recording signal. 9 is an attached telephone.

FIG. 2 shows a circuit diagram including the contacts of the line monitoring circuit 1 and the relay 2.

In FIG. 2, Ll and Ll represent central lines, and 11 represents a disconnector. 21 and 22 are relay contacts of the relay 2. Line monitoring circuit 1 includes capacitor C1 and resistor R
1-R4, diodes D1, D2, photocouplers 12-1
5, the anode potential of the diode D1, the commonly connected diode D1. Potential of cathode of D2, resistance R
4 is supplied to the control circuit 7 as outputs A, B, and C, respectively, and the control circuit 7 outputs A, B.
, C is configured to detect central line closure.

It is now assumed that the separator 11 and the relay contacts 21 and 22 are in the contact positions shown in FIG.

First, the case of incoming call will be explained. Central line L+.

The bell signal (alternating current) arriving at Ll is supplied to the photocouplers 12 and i3 via the central office line L1, the capacitor ``l-CI, the relay contact 21, and the resistor R1.
13 to the intermediate tap on the primary side of the line transformer 3, and is applied to the station line L2 via the primary side of the line transformer 3 in the opposite path to the above. When the bell signal is applied in the opposite path, the anode and cathode sides of the diode D1, that is, the outputs A and B, become high potential outputs, and when the bell signal is applied in the path from the central line L1 to Ll, the output of the diode D2 becomes a high potential output. The cathode side, that is, the output B has a high potential, and the output A repeats high and low potential outputs, and the output B becomes a high potential output, and the control circuit 7 detects an incoming call.

Once a call is received, the relay contact 22 is turned on by the control circuit 7, and the direct current flows along the route from the station line L1 to L1 or from the station line L2 to L1. In this state, output A is maintained at a high potential or low potential, and output B is always at a high potential.

If the caller hangs up, or hangs up, -
There is no direct current in the instantaneous line. As a result, the output B becomes a low potential output during the period when the DC current is cut off at the same time as the DC current disappears. Then, the control circuit 7 detects that the calling party has dialed first.

Next, when the handset of the telephone set 9 is lifted, a direct current flows from the office line L1 to Ll or from the office line -Ll to Ll via the telephone ta9 and the photocoupler 14 or 15. Due to this direct current, the emitter potential of the phototransistor constituting the photocoupler 14, 15, that is, the output C becomes a high potential output, and the control circuit 7 detects that the receiver of the telephone ta9 has been hung up.

As described above, the line monitoring circuit 1 detects the closure of the line, and the control circuit 7 detects it.

Now, when an instruction signal for call recording, call playback, etc. is supplied from the keyboard 8 to the control circuit 7, the control circuit 7 checks the outputs A, B, and C from the line monitoring circuit 1, and if the central office line is closed. When connected, the central office line is connected in an alternating current manner (in the incoming call state described above), and the tape drive section 6 is driven. At this time, if call recording is instructed by an instruction signal from the keyboard 8, the tape drive section 6 is in the recording state and the recording amplifier 5 is in the operating state, or the call reproduction is instructed by the instruction from the keyboard 8. When this is the case, the tape drive unit is controlled to be in the playback state and the output amplifier 4 is controlled to be in the operating state. There, the call will be recorded or played back.

Furthermore, when a caller's first call is detected, call recording and playback are stopped.

In addition, when a caller's first call is detected during automatic answering or automatic recording, the operation is the same as in the previous case.
2 is opened, the response tape is run to the end, and it is controlled to be in a standby state.

As described above, according to the present invention, a line monitoring circuit is provided to detect the closure of the office line, and the call recording and call playback modes are enabled only when the office line is closed. ,
Accidentally erasing the recorded contents on the tape,
This prevents unnecessary signals from being sent to the line.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention, and FIG. 2 is a circuit diagram showing a line monitoring circuit in one embodiment of the present invention. 1...Line monitoring circuit, 2...Relay,
3... Line transformer, 4... Sending amplifier, 5... Recording amplifier, 6... Tape drive section, 7... Control circuit. , 9...Telephone, 11...Separator, 12-15...
・Photocoupler, Ll and Ll... Central line.

Claims (1)

[Claims] An answering machine having a call recording and/or call playback function includes a detection means for detecting the closure of a central office line to which the answering machine is connected, and the detection means detects the closure of the central office line. An answering machine characterized in that call recording and call playback functions are enabled only when the user is present.